| Number | Date | Country | Kind |
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| D587694 | Sculler et al. | Mar 2009 | S |
| 7537189 | Jung et al. | May 2009 | B2 |
| 20080156949 | Sculler et al. | Jul 2008 | A1 |
| 20080210837 | Burns | Sep 2008 | A1 |